JCH
Java Community | Help. Code. Learn.•11mo ago
straightface

Backoff and retry for parallel api calls

I have a list of objects that i make parallel api calls and store the result in database. But the problem I am having now is the api goes down and subsequent calls fails I am not sure how I should implement backoff and retry since these are parallel calls I have already executed those 
  @Async
  public CompletableFuture<String> apiCall(String payload){
     ...    resttemplate
     return CompletableFuture.completedFuture(..);
  }

// Calling class
  
  public List<String> getResponses(List<String> payloads){
  List<CompletableFuture<String>> futures = new ArrayList<>(); 
  for(String payload : payloads){
     futures.add(apiService.apiCall(payload));  
  }

  return futures.stream()
         .map(CompletableFuture::join)
         .toList(); 
}
  @Async
  public CompletableFuture<String> apiCall(String payload){
     ...    resttemplate
     return CompletableFuture.completedFuture(..);
  }

// Calling class
  
  public List<String> getResponses(List<String> payloads){
  List<CompletableFuture<String>> futures = new ArrayList<>(); 
  for(String payload : payloads){
     futures.add(apiService.apiCall(payload));  
  }

  return futures.stream()
         .map(CompletableFuture::join)
         .toList(); 
}
1 Reply
JavaBot
JavaBot•11mo ago
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